"AT&T technicians are determining the root cause of the service interruption and will work around the clock to restore service to affected customers," Lewandowski said around noon.

Just after 2 p.m., the company said it had fully restored service.

"AT&T wireless service is now fully restored for customers in the Knoxville, Chattanooga, Tri-Cities and East Tennessee markets," Lewandowski said. "We apologize for any inconvenience as a result of the service interruption earlier today."

For more information, pick up a copy of Friday's Chattanooga Times Free Press.